from django.db import models
from django.contrib.auth.models import AbstractUser
from itsdangerous import BadData
from itsdangerous import TimedJSONWebSignatureSerializer as TJSSerializer
from django.conf import settings

from meiduo.utils.models import BaseModel
from . import constants
# Create your models here.

# django提供的用户模型字段不全， 需要自定义  继承AbstractBaseUser


class User(AbstractUser):
    """用户模型"""

    mobile = models.CharField(max_length=11, unique=True, verbose_name="手机号码")
    email_active = models.BooleanField(default=False, verbose_name='邮箱验证状态')
    # 默认地址怎么和地址关联  'Address'这里必须是字符串 因为'Address'卸载下面
    default_address = models.ForeignKey('Address', related_name='users', null=True, blank=True, on_delete=models.SET_NULL, verbose_name='默认地址')
    class Meta:
        db_table = "tb_users"
        verbose_name = '用户'
        verbose_name_plural = verbose_name

    def generate_verify_email_url(self):
        """生成验证邮箱的url"""
        # 创建加密的序列化器对象
        serializer = TJSSerializer(settings.SECRET_KEY, expires_in=constants.VERIFY_EMAIL_TOKEN_EXPIRES)
        # 构造要加密的数据
        data = {'user_id': self.id, 'email': self.email}
        # 加密
        token = serializer.dumps(data).decode()
        verify_url = 'http://www.meiduo.site:8080/success_verify_email.html?token=' + token
        return verify_url

    @staticmethod
    def check_verify_email_token(token):
        """
        解密邮箱 并获取user
        因为这个地方没有用到self
        这个地方要用静态方法， 因为self代表了user， 所以参数不能有user
        :param token:
        :return:
        """
        serializer = TJSSerializer(settings.SECRET_KEY, expires_in=constants.VERIFY_EMAIL_TOKEN_EXPIRES)
        # 解密
        try:
            data = serializer.loads(token)
        except BadData:
            return None
        email = data.get('email')
        user_id = data.get('user_id')

        # 获取user
        try:
            user = User.objects.get(id=user_id, email=email)
        except User.DoesNotExist:
            return None
        else:
            return user


class Address(BaseModel):
    """
    用户地址
    """
    user = models.ForeignKey(User, on_delete=models.CASCADE, related_name='addresses', verbose_name='用户')
    title = models.CharField(max_length=20, verbose_name='地址名称')
    receiver = models.CharField(max_length=20, verbose_name="收货人")
    province = models.ForeignKey('areas.Area', on_delete=models.CASCADE, related_name='province_addresses', verbose_name='省')
    city = models.ForeignKey('areas.Area', on_delete=models.PROTECT, related_name='city_addresses', verbose_name='市')
    district = models.ForeignKey('areas.Area', on_delete=models.PROTECT, related_name='district_addresses',
                                 verbose_name='区')
    place = models.CharField(max_length=50, verbose_name='地址')
    mobile = models.CharField(max_length=11, verbose_name='手机')
    tel = models.CharField(max_length=20, null=True, blank=True, default='', verbose_name='固定电话')
    email = models.CharField(max_length=30, null=True, blank=True, default='', verbose_name='电子邮箱')
    is_deleted = models.BooleanField(default=False, verbose_name='逻辑删除')

    class Meta:
        db_table = 'tb_address'
        verbose_name = '用户地址'
        verbose_name_plural = verbose_name
        ordering = ['-update_time']